Boron: Emissions
Why boric acid carries less carbon than borax
What this tab covers The greenhouse-gas footprint of the commodity at a global level, split by lifecycle phase: extraction (or farming), refining and processing, movement, usage, and recycling or end of life. Intensities are per unit of product; the global total combines intensity with world output. Also covers other environmental impacts and the main levers to cut emissions. Emission intensity 0.50 t CO2e per t range 0.50 (boric acid) to 1.26 (borax pentahydrate); sodium perborate 1.70 · cradle-to-gate, ILCD 2011 midpoint Global emissions per year 3.00 Mt CO2e per year 2025 · derived range 2-4 Mt: Turkey's 1.5 Mt refined borates x 0.5-1.3 t CO2e/t gives 0.75-1.9 Mt, scaled for Turkey's about 45% share of outputPer t of boric acid; cradle-to-gate (open-pit mining, beneficiation, refining), Turkish production chain. Intensity: Türkbay et al. 2022, Sustainability 14(3):1787. Global total: Derived from USGS MCS 2026, WMD 2026 and Türkbay et al. 2022 (indicative).
Share of footprint by lifecycle phase
Extraction 7% Refining / processing 93%Footprint by lifecycle phase
| Phase | Intensity | Share | Main sources of emissions | Notes | Source |
|---|---|---|---|---|---|
| Extraction | small; within the residual of about 0.04 t CO2e/t | 7% | diesel trucks and shovels in open pits, beneficiation (washing, screening) | The study reports mining and beneficiation as smaller contributors than refining; 7% is the residual not assigned to steam, acid and electricity | Türkbay et al. 2022 |
| Refining / processing | about 0.46 t CO2e/t: steam 0.23, sulphuric acid 0.14, electricity 0.09 | 93% | steam for dissolving and crystallising, sulphuric acid to convert colemanite to boric acid, drying | Steam is the largest driver for all borate products | Türkbay et al. 2022 |
| Movement | not included in the gate figure; not published | – | bulk shipping from Turkey and California to China, India and Brazil | Outside the cradle-to-gate boundary | Türkbay et al. 2022 (boundary) |
| Usage | not applicable as combustion | – | borates in glass fibre insulation and solar glass enable energy savings; B2O3 lowers glass melting energy | Avoided emissions are real but not quantified in the sources reviewed | USGS MCS 2026 (uses) |
| Recycling / end of life | not applicable | – | dispersed in glass, ceramics, detergents and fertiliser | Recycling insignificant (USGS); EU end-of-life recycling input rate 1% | USGS MCS 2026; EU CRM 2023 |
Other environmental impacts
Refining produces large tailings and clay waste ponds; boron-rich waste water is a local water-quality concern. Steam raising often uses fuel oil or gas, and heavy fuel oil is cited as a driver of ozone-depletion impacts.
Levers to cut emissions
- Replace fossil steam with heat pumps, waste heat or low-carbon boilers (steam is about 46% of boric acid emissions)
- Cut sulphuric acid use or source acid from low-carbon sulphur-burning plants (about 29%)
- Use low-carbon electricity (about 18%)
- Recover borates from lithium brine and clay projects that are already processing the ore
India
India has no borate production and imports 11.3% of world natural-borate value (2024) plus refined borax and boric acid, so its footprint is embedded in Turkish and US production (UN Comtrade 2024; USGS MCS 2026).
Emission figures are indicative global averages from the life-cycle studies named; actual footprints vary widely by site, energy mix and method.